1.直接写结果。
0.2+0.5=
1-0.7=
8.7-0.4=
2.6+5.3=
1.3-0.8=
7+1.3=
0.23+0.77=
2-0.03=
21+2.1=
93-0.3=
7.2-7.02=
5+2.8=
4.1+4.1=
10-1.5=
8.2+2.8=
9.9-8.8=

0.2+0.5=0.7
1-0.7=0.3
8.7-0.4=8.3
2.6+5.3=7.9
1.3-0.8=0.5
7+1.3=8.3
0.23+0.77=1
2-0.03=1.97
21+2.1=23.1
93-0.3=92.7
7.2-7.02=0.18
5+2.8=7.8
4.1+4.1=8.2
10-1.5=8.5
8.2+2.8=11
9.9-8.8=1.1

2.竖式计算。
13.2-8.15=
10.18+4.93=
59.8+15.37=
32.5+3.25=
6.27-2.84=
72.5-7.25=

13.2-8.15=5.05
```
13.20
8.15
--------
5.05
```
10.18+4.93=15.11
```
10.18
+ 4.93
--------
15.11
```
59.8+15.37=75.17
```
59.80
+ 15.37
--------
75.17
```
32.5+3.25=35.75
```
32.50
+ 3.25
--------
35.75
```
6.27-2.84=3.43
```
6.27
2.84
--------
3.43
```
72.5-7.25=65.25
```
72.50
7.25
--------
65.25
```

3.改错。
$\begin{array}{r} 14.6\\ +\ 2.74\\ \hline 4.20\end{array}$（ ） ______

(×)
$\begin{array}{r} 14.60\\ +\ 2.74\\ \hline 17.34\end{array}$
(×)
$\begin{array}{r} 27.60\\ -\ 3.29\\ \hline 24.31\end{array}$